That number will fluctuate throughout the day and beyond, but Twitter already has passed the $24 billion market value of LinkedIn, whose stock is up about 87% this year and is often labeled as overvalued. (SeekingAlpha in fact recently called it an “almost ridiculous valuation.”)

The two companies have different business models — Twitter is almost entirely reliant on advertising, while LinkedIn makes most of its money on subscriptions and recruiting services — but they’re also among the few publicly traded social-media players, making the comparison inevitable.

If you’re keeping score at home, LinkedIn has more than twice the revenue and is profitable, while Twitter is deep in the red but growing faster. Twitter is also three years younger. Here is what their bottom-line financials looked like in the first nine months of this year:

So Twitter is trading at about 38 times estimated 2013 sales, while LinkedIn trades at about 16 times 2013 sales estimates.

How do their market values compare with the biggest player in social media, Facebook? Its worth about $115 billion, so its nearly five times greater. Facebook trades at about 15.7 times sales estimates for the year, closer to LinkedIn.

Here’s a chart in today’s WSJ that compares Twitter’s initial market value – at $14.4 billion with other brand-name companies. Look how far it has moved up that scale – it’s now in LinkedIn territory. Also look at how tiny their revenue dots are relative to the others. (LinkedIn’s stock is down today so it slid a bit backward.)